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Uncertainties in SeaSonde Current Velocities
Belinda Lipa
Status: Accepted
Codar Ocean Sensors
125 La Sandra Way
Portola Valley , CA USA
94028
Phone: 650 851 5517
Email: blipa@pogo.com
Co-Authors:
A measurement is incomplete without an estimate of its uncertainties.
SeaSonde output now includes uncertainty estimates in both radial and
total velocity vectors.
A single SeaSonde unit measures the component of the velocity radial to
the radar. The main source of uncertainty in these radial vectors is the
spatial and temporal variation of the current velocity field within the
radar scatter patch.
When there are many different current velocities present in the radar
scatter patch, they each can produce a solution in the Seasonde calculation,
all of which are averaged to give the final output velocity. We calculate
the standard deviation of these radial velocities, which is actually a
measure of the horizontal velocity shear.
The radial current map changes with time due to changing ocean current
patterns; the software also outputs the standard deviation over time of
each mean velocity.
To obtain the total current vector, radial vectors from two or more radar
sites are combined in the least-squares sense, using a linear transformation.
The standard deviations in the resulting total velocities follow from
those in the radials using standard linear error propagation. This automatically
includes the effects of geometry as well as the radial velocity uncertainties.
Submitted on October 11, 2002
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